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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20220329T123000
DTEND;TZID=Atlantic/Canary:20220329T133000
UID:iactalks-1549
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1549
CREATED:2022-03-29T12:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Extreme galaxies in fundamental scaling relations
DESCRIPTION:Extreme galaxies in fundamental scaling relations\nDr. Pavel E.
  Mancera Piña\n\nI will discuss the location of rather extreme galaxy pop
 ulations in two  of the most important scaling laws for disc galaxies: the
  baryonic  Tully-Fisher relation (BTFR) and the specific angular momentum-
 mass  relation. First, I will present recent results on the dynamics of  g
 as-rich, extended low surface brightness galaxies, sometimes called  ultra
 -diffuse galaxies (UDGs). Using a robust kinematic modelling  fitting tech
 nique, we find that gas-rich UDGs are outliers of the BTFR  and have baryo
 n fractions as high as the cosmological average. Moreover,  I will show th
 at mass models of a gas-rich UDG cannot be reconciled  with a standard col
 d dark matter halo. In the second part of the talk, I  will present new me
 asurements of the stellar, gas, and baryonic  specific angular momenta of 
 disc galaxies, to then derive the relations  between the specific angular 
 momenta (j) and mass (M). I will report the  discovery of empirical correl
 ations between j, M, and the gas fraction.  These relations are very tight
  and are followed very well not only by  normal galaxies but also by a set
  of extreme galaxies that are outliers  of other scaling relations. Our sc
 aling laws provide a direct benchmark  to test the outcome and predictions
  of hydrodynamical simulations and  semianalytical models.\n 
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